Oscillators – Solid state active element oscillator – Transistors
Patent
1997-07-30
1999-08-24
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331108C, 331117FE, 331117D, 331177R, H03B 714
Patent
active
059429526
ABSTRACT:
A VCO includes a transistor having a plurality of negative differential resistance devices coupled in series to the source terminal of the transistor, with each of the devices having a negative differential resistance operating region. Biasing circuits are coupled to the drain and gate terminals along with operating voltages which set the oscillator to operating in a negative differential resistance region of at least one of the negative differential resistance devices so that oscillations of a selected frequency are produced at an output terminal. The transistor, the plurality of N devices, the DC biasing circuits, and the operating voltages are connected so that the oscillator negative differential resistance operating region is greater than N times as wide as each of the device negative differential operating regions individually.
REFERENCES:
patent: 3246456 (1966-04-01), Sommers, Jr.
patent: 3312911 (1967-04-01), De Boer
patent: 3701051 (1972-10-01), Simms
Olga Boric-Lubecke et al., "DC Instability of th Series Connection of Tunneling Diodes", IEEE Transactions on Microwave Theory and Techinques, vol. 44, No. 6, Jun. 1996, pp. 936-943.
Olga Boric-Lubecke et al., "Fundamental and Subharmonic Excitation for an Oscillator with Several Tunneling Diodes in Series", IEEE Transactions on Microwave Theory and Techniques, vol. 43, No. 4 Apr. 1995, pp. 969-976.
El-Zein Nada
Goronkin Herbert
Maracas George N.
Nair Vijay K.
Shiralagi Kumar
Grimm Siegfried H.
Motorola Inc.
Parsons Eugene A.
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